add include_rails_helper option
fix experiment setting parsing for boolean values
include resettable experiment setting from Split.configuration.experiments
Add Split::EncapsulatedHelper that you can mix into Rails controllers and models that will only expose ab_test and ab_test_finished
include encapsulated_helper
fix for params not found
Merge pull request #213 from jonashuckestein/master

Fix minor bugs, potentially refactor helper.rb